Google Open Source - All of Googles open source projects under a single umbrella
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Open Source @IFTTT - A collection of IFTTT OSS projects.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Code NASA - 253 NASA open source software projects
iTerm2 - A terminal emulator for macOS that does amazing things.